poul_249 wrote:
Still not able to understand. Could someone explain ?
You have to visualise the problem as set problem...
Given 87 Balls with Red and Green colour
So the set equation becomes;
Total (Red & Green Balls) = #Red Balls + # Green Balls - Both (Red & Green)Given is 2/7 of Red balls also are Green ==> Both ( Red and green) =
\(\frac{2}{7}\) * # Red BallsAlso it is stated that 3/5 of Green balls are red, which is again stating that ==> Both ( Red and green) =
\(\frac{3}{7}\) * # Green BallsEssentially it means that
#Red Balls = \(\frac{7}{2}\)* Both (Red and Green)Also it means that
#Green Balls = \(\frac{7}{3}\)* Both (Red and Green)Now coming back to original equation
Total (Red & Green Balls) = #Red Balls + # Green Balls - Both (Red & Green)Substituting the values we got above
87= \(\frac{7}{2}*Both + \frac{7}{3}*Both - Both\)So Both = 18
We are asked to find Both/Total =
\(\frac{18}{87}\) =
\(6/29\)Hope it helps , pls press Kudos